PE Central is a website created for Health and Physical Education Teachers by Virginia Tech.
Active Academics explains how to create 10 min lessons in a regular classroom environment that use movement. This site was created by Concord University in southern WV.
American Council on Exerciseprovides information on many different types of exercises.
Body and Mind - BAM! contains lesson plans, a companion kid's website, and more from the CDC.
Gatorade Sports Science Institutecontains information on hydration, sports nutrition, sports injuries, and more.